Which of the following is the most accurate measurement?

9 m

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9.0 m

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9.00 m

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9.000 m

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Solution

The correct option is D 9.000 m
Accuracy is determined by the number of significant figures. Higher the significant figure more is the accuracy.

$9.000 m$ has 4 significant figures thus its most accurate.

Hence, the correct answer is option $D$ .

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